Abstract
Pseudomonas pseudoalcaligenes strain POB310 degrades 3-and 4-carboxydiphenyl ether. The initial reaction involves an angular dioxygenation yielding an unstable hemiacetal that spontaneously decays to phenol and protocatechuate. We cloned a DNA fragment containing the gene encoding the initial, dioxygenase from an unstable, self-transmissible plasmid. Sequence analysis revealed two open reading frames encoding proteins with putative molecular masses of 46.3 and 33.6 kDa. The deduced amino acid sequences showed homologies to oxygenase and reductase subunits of aromatic ring-activating dioxygenases, and contained regions identical to consensus sequences that bind chloroplast-like and Rieske-type [2Fe2S] clusters suggesting that the initial dioxygenase is a class IA aromatic ring-activating dioxygenase system. Intitial dioxygenase activity was induced in bacteria grown in M9 minimal medium containing 3-or 40-carboxydiphenyl ether or phenol as carbon source, indicating that the regulation is dependent on the phenol pathway. The maximal specific activity was measured at the beginning of the exponential growth phase.
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Dehmel, U., Engesser, KH., Timmis, K.N. et al. Cloning, nucleotide sequence, and expression of the gene encoding a novel dioxygenase involved in metabolism of carboxydiphenyl ethers in Pseudomonas pseudoalcaligenes POB310. Arch. Microbiol. 163, 35–41 (1995). https://doi.org/10.1007/BF00262201
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DOI: https://doi.org/10.1007/BF00262201